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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99bc9109cca97a5a9b0a29a4fe21068fbba9a5311157f77cf412227ea6896bb6' 
  AND token = 'tw86AHFoN3Y1yR2S6p6iBKu2LPWC9j5od4K+3/kVqD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}